Why has football rules changed over the years?

1. Football rules have changed to ensure safety to all players.

1.1. Under the new rules which the NFL is trying out this season, extra-point kicks are now taken 33 yards from the goal posts (which is 15 yards out from the goal line.) That additional distance has already caused kickers across the league to miss 13 attempts. Since 2000, the kicker success rate for extra points has been either 99% or 98% every season, the New York Times reported, and this season it’s currently 95%.

2. Rules changed for plays and kicks.